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Radio and Electronic Engineer

Issue 4 • Date April 1980

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Displaying Results 1 - 8 of 8
  • Engineering under the Microscope

    Publication Year: 1980, Page(s):135 - 136
    IEEE is not the copyright holder of this material | PDF file iconPDF (280 KB)
    Freely Available from IEEE
  • Conference on 'Digital processing of signals in communications'

    Publication Year: 1980
    IEEE is not the copyright holder of this material | PDF file iconPDF (134 KB)
    Freely Available from IEEE
  • IMACS congress 1979: Simulation of systems

    Publication Year: 1980
    IEEE is not the copyright holder of this material | PDF file iconPDF (136 KB)
    Freely Available from IEEE
  • The development of speech encipherment

    Publication Year: 1980, Page(s):147 - 155
    Cited by:  Papers (1)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1217 KB)

    This paper surveys some past and present principles of speech coding. The advent of digital logic systems and integrated circuit components is seen as a major turning point in the implementation of effective coding principles that could not previously be used satisfactorily. Various coding methods are discussed, covering frequency domain, time domain and analogue and digital output systems. The pr... View full abstract»

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  • A special-purpose delta multiplier

    Publication Year: 1980, Page(s):156 - 157
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (242 KB)

    A circuit is proposed which transforms a delta sequence (d.s.) of a signal into another delta sequence of a double amplitude signal. With the proposed circuit, it is possible to transform the d.s. of half-sums obtained from the conventional delta-adders into a d.s. of the corresponding full sums. This increases the flexibility of the realization of digital filters with delta input-output sequences... View full abstract»

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  • An integrated circuit v.h.f. radio receiver

    Publication Year: 1980, Page(s):158 - 164
    Cited by:  Papers (15)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1146 KB)

    A radio receiver system for frequency-modulated signals is described which uses a direct conversion (zero intermediate frequency) technique. The characteristics of the system are developed especially in areas of difference from conventional methods. The realization is shown of the complete receiver in two integrated circuits which form part of a synthesized 30 to 88 MHz equipment. The conclusion i... View full abstract»

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  • An analysis of possible drive schemes for complex liquid-crystal displays

    Publication Year: 1980, Page(s):165 - 176
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1384 KB)

    The paper is concerned with the problem of generating complex patterns on two-dimensional liquid-crystal arrays, without either an excessive number of control terminals or prohibitively complex control circuits. Following a brief introduction to the operating principles of liquid-crystal displays, the initial Section indicates how the problem could be solved using a two-dimensional shift-register/... View full abstract»

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  • The choice of a recording code

    Publication Year: 1980, Page(s):177 - 193
    Cited by:  Papers (2)
    IEEE is not the copyright holder of this material | Click to expandAbstract | PDF file iconPDF (1665 KB)

    A detailed comparison of recording codes, using superposition, is used to show that there is little to choose between the popular ones, as regards maximum achievable data density. It is shown that relatively few general classifications are necessary to encompass all the codes, and that, within each classification, it is often possible to say which code is optimum. A guide to the selection of an ef... View full abstract»

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